Finding a construction company in Dulwich that actually turns up, charges what they quoted, and finishes on time is harder than it should be. The area has no shortage of builders advertising on Google, but the gap between a polished website and a well-run building site is often wider than the side return extension you’re planning.
We’ve put together a list of ten construction companies that serve Dulwich homeowners and have verifiable track records. Some are based locally, others work out of nearby South East London postcodes. All of them have real reviews, real accreditations, or both.
A word on how this list works: All Well Property Services sits at number one, and we’re upfront about the fact that this article is published on our website. We’ve justified our position with specific, checkable facts rather than vague claims about being “the best.” Every other company on this list is a genuine competitor doing solid work in the Dulwich area. We’ve included them because a homeowner reading this deserves real options, not a thinly disguised advert.
1. All Well Property Services
Based: Anerley, London SE20 8QR (1.8 miles from Dulwich Village) Founded: 2020 Google rating: 5.0 stars from 57 verified reviews Accreditations: NICEIC, FENSA, CHAS, BAFE, SSAIB Website: allwellpropertyservices.co.uk
All Well tops this list for a combination of reasons that are easy to verify independently.
Start with the Google reviews. A 4.5-star rating from 57 reviews is unusual for a construction company. Most builders with more than 20 reviews sit between 4.2 and 4.7. Maintaining a great score at that volume means either every client was satisfied or the company resolved problems before they reached a public review. Either way, the number speaks for itself.
The accreditation stack is broader than most companies on this list. NICEIC covers electrical work (meaning All Well can self-certify Part P compliance without hiring a separate electrician). FENSA covers window and door installations. CHAS confirms health and safety standards. Most builders in Dulwich hold one or two of these. Holding all three, plus BAFE and SSAIB, means the company can handle multi-trade projects without subcontracting the compliance-sensitive elements.
All Well publishes fixed-price contracts on every project. That’s worth paying attention to, because the most common complaint against builders on Checkatrade and TrustATrader isn’t poor workmanship: it’s cost overruns. A fixed price means the quote is the final price, with variations only by written agreement.
The company also publishes eight free planning tools on its website, including a kitchen extension cost calculator, planning permission checker, and party wall agreement checker. No other construction company on this list offers anything comparable. For a Dulwich homeowner trying to work out whether their rear extension falls under permitted development, or whether a kitchen extension in SE21 is worth the investment, those tools answer the question before you’ve picked up the phone.
Services: Kitchen extensions, bathroom fitting, side return extensions, loft conversions, media wall installations, property renovations, garage conversions, damp proofing, painting and decorating.
Why they’re number one: Verifiable 4.5-star rating at volume, triple accreditation (NICEIC/FENSA/CHAS), fixed-price contracts as standard, transparent published pricing, and free planning tools that no competitor matches. Based less than two miles from Dulwich Village with specific experience on Victorian and Edwardian terraces across SE21 and SE22.
2. Build & Create Construction Ltd
Based: Blackheath, London SE3 7EJ Founded: 2013 by Clinton Ham Accreditations: FMB member, Checkatrade vetted Website: buildandcreate.co.uk
Build & Create has been operating out of Blackheath for over a decade and regularly takes on projects in Dulwich. Clinton Ham, the founder and managing director, is hands-on across every project, which is uncommon once a building company reaches a team of 14.
Their Checkatrade reviews are strong, with clients consistently mentioning communication, tidiness, and willingness to accommodate changes mid-build without hidden costs. They’ve completed kitchen extensions, loft conversions, and full refurbishments across SE21 and SE24.
The FMB membership is worth noting. The Federation of Master Builders requires proof of insurance, financial checks, and on-site inspections. It’s not a rubber stamp.
Best for: Homeowners who want a design-led approach with bespoke joinery, and who value a managing director who personally oversees the build.
3. MAC Construction D&B Ltd
Based: South East London Established: Over 20 years Listed on: TrustATrader (vetted) Website: Contact via TrustATrader
MAC Construction is a family-run business managed by Natasha, Fay, and Chelsea. They cover kitchen extensions, bathroom renovations, and full refurbishments across South East London including Dulwich.
The family management model means you meet the people running your project at the initial site visit, and they stay involved throughout. TrustATrader reviews highlight communication and project management as particular strengths, with clients noting that “all the tradespeople were great.”
Two decades in business is a meaningful signal in an industry where many firms fold within five years. Longevity alone doesn’t guarantee quality, but it does suggest the company delivers consistently enough to sustain referrals.
Best for: Homeowners who want to deal with the business owners directly, not a sales team.
4. Building Plus
Based: South East London Coverage: SE21, SE22, and surrounding postcodes Website: building-plus.co.uk
Building Plus positions itself as a “hands-on building company,” and their website reflects that. No marketing waffle, just descriptions of what they do and where they work.
They specialise in house extensions, home refurbishments, loft conversions, and kitchen renovations across Dulwich, Dulwich Village, East Dulwich, and West Dulwich. Their FAQ section is practical: they confirm coverage by postcode, explain how scope changes are handled (discussed, priced, and agreed in writing before proceeding), and note that the same core team stays on the job.
If you send them drawings with a note about your priorities (space, light, layout, budget), they’ll give you a steer before committing to a full site visit. That approach saves time for both parties.
Best for: Homeowners who have architectural drawings ready and want a builder who’ll give a straight answer on cost and timeline.
5. Alstruct Ltd
Based: London Accreditations: CHAS Elite, FMB accredited Website: alstruct.co.uk
Alstruct targets the premium end of the Dulwich market, with a focus on conservation area properties and heritage-sensitive renovations. Their Dulwich page references specific streets (College Road, Calton Avenue) and the Dulwich Estate’s architectural guidelines, which suggests genuine local experience rather than a generic area page.
CHAS Elite is a step above standard CHAS accreditation, requiring more rigorous health and safety documentation. Combined with FMB membership, it signals a company that takes compliance seriously.
Their services include whole-house renovations, basement conversions, and bespoke rear extensions. Pricing sits at the higher end, reflecting the conservation area expertise and premium finishes they specialise in.
Best for: Listed properties, Dulwich Estate homes, and projects where conservation area planning is a factor. Not the right fit if you’re watching the budget closely.
6. KFM Building Contractors
Based: South East London Accreditations: FMB member Coverage: Dulwich SE21 and surrounding area Website: kfmbuilding.co.uk
KFM Solutions Ltd, trading as KFM Building Contractors, has an FMB membership that comes with a guarantee covering defective works. They specialise in house extensions, loft conversions, kitchen refurbishments, and bathroom fitting across Dulwich SE21.
Their website mentions brickwork and structural repair services alongside the standard extension and conversion work, which is useful if your project involves a Victorian property with existing structural issues that need resolving before you extend.
Phone-based initial consultations and free quotes are standard.
Best for: Dulwich homeowners who need both structural repair work and renovation under one contractor.
7. London Pro Builders
Based: Sydenham, London SE26 4JD Experience: 25+ years Listed on: TrustATrader Website: Contact via TrustATrader
London Pro Builders covers Dulwich from their base in Sydenham, less than three miles away. The 25-year track record is one of the longest on this list.
Their TrustATrader listing shows completed refurbishment projects with reviews praising workmanship standards. They cover Beckenham, Bromley, Sydenham, Forest Hill, Brockley, Catford, Lewisham, Penge, New Cross, Eltham, and Lee Green alongside the Dulwich postcodes.
The broad coverage area can be a double-edged sword: it means they’re experienced across different property types and boroughs, but it also means they may not be as focused on Dulwich-specific planning nuances as a more locally concentrated firm.
Best for: Full property refurbishments where the project involves structural work, multiple trades, and a longer timeline.
8. Buildify Ltd
Based: London Coverage: Dulwich Village SE21, East Dulwich SE22, West Dulwich Website: buildifyltd.co.uk
Buildify positions itself as a design-and-build firm with in-house structural engineers and party wall surveyors. Their Dulwich pages cover rear extensions, side return extensions, wraparound extensions, and loft conversions.
The party wall surveyor offering is a practical detail. In Dulwich, where most extensions on terraced and semi-detached properties require Party Wall Act notices, having the surveyor within the same firm can speed up the pre-construction phase by two to four weeks.
They also handle Building Control applications as part of the service, which removes another administrative step for the homeowner.
Best for: Homeowners who want a single company to handle design, structural engineering, party wall, and construction under one roof.
9. Adis Team Construction Ltd
Based: South London Experience: 10+ years Listed on: TrustATrader (vetted) Website: Contact via TrustATrader
Adis Team Construction covers Central and South West London, including the Dulwich area. Their TrustATrader listing includes reviews from projects across multiple South London postcodes.
Reviewers mention the company being recommended by colleagues and friends, which is the strongest form of endorsement in construction. The review profile suggests they handle mid-range residential projects: extensions, refurbishments, and internal renovations rather than high-end bespoke work.
Best for: Mid-range budgets where you need reliable workmanship on a standard extension or refurbishment.
10. Redwood Roofing and Building Ltd
Based: South East London Listed on: Rated People Website: Contact via Rated People
Redwood Roofing and Building is a family-run business led by Managing Director Patrick O’Brien. Their Rated People profile shows reviews for projects in the East Dulwich and surrounding areas, with clients highlighting reliability, punctuality, and high-standard finishes.
As the name suggests, roofing is a core strength, which makes them particularly relevant if your Dulwich project involves a loft conversion or roof-related structural work alongside a general extension or renovation.
Best for: Projects with a significant roofing or loft element, or homeowners who prefer a family-run firm with a roofing specialism.
How to choose the right construction company for your Dulwich project
These ten companies represent a range of sizes, specialisms, and price points. Here’s a practical framework for narrowing down your shortlist:
Check accreditations against your project scope. If your project involves electrical work (media walls, kitchen rewires, extension electrics), you need a company with NICEIC or equivalent Part P certification. If it involves new windows or doors, FENSA registration means the installation is self-certified. Without these, you’ll need to hire and pay for separate certified contractors.
Ask about the contract structure. Fixed-price contracts protect you from cost overruns. If a builder quotes on a “cost-plus” or day-rate basis, your final bill depends on how long the job takes rather than what was agreed upfront. In Dulwich, where a kitchen extension can run £50,000 to £120,000, the difference between a fixed quote and an open-ended one is serious money.
Verify the Google reviews yourself. Click through to the actual reviews, not just the star rating. Look for reviews that mention specific projects (extensions, bathrooms, loft conversions) rather than generic praise. Sort by lowest rating first: how a company handles its worst review tells you more than its best one.
Check Companies House. Every limited company on this list has a registration number you can look up at gov.uk/get-information-about-a-company. Check the filing history, confirmation statements, and how long the company has been active. A company that’s filed consistently for a decade is a different proposition to one incorporated last year.
Get three quotes minimum. The FMB, TrustATrader, and Checkatrade all recommend at least three quotes for any project over £5,000. In Dulwich, the spread between the lowest and highest quote on a kitchen extension can easily be £20,000 to £30,000. The cheapest isn’t always the worst, and the most expensive isn’t always the best. What matters is what’s included, what’s excluded, and whether the price is fixed.
If you’re starting a renovation project in Dulwich and want to compare options, pick three companies from this list that match your project type and budget, request site visits, and compare the written quotes side by side. That’s the most reliable way to find the right builder for your home.
All Well Property Services provides kitchen extensions, bathroom fitting, loft conversions, and property renovations across Dulwich, East Dulwich, West Dulwich, and surrounding South East London areas. Request a free consultation at allwellpropertyservices.co.uk or call 020 3920 9617.
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Company Name: All Well Property Services
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To view the original version on ABNewswire visit: 10 Best Construction Companies in Dulwich (2026)
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